John wesley busk



(No Model.)

, J. W. RUSK.

JACK FOR EXTRAOTING PISTONS.

No. 440,609. Patented Nov. 11, 1890.

H d J WWI Leases avwemlioz SZI/m Z1? T writer JWm Mrleyfiusf @2513 $2 fl/Ho UNITED STATES PATENT OFFICE.

JOHN WESLEY RUSK, OF UHRIOHSVILLE, OHIO, ASSIGNOR OF ONE-HALF TO A. VVINOHELL, OF-SAME PLACE.

JACK FOR EXTRACTING PISTONS.

SPECIFICATION-forming part of Letters Patent No. 440,609, dated. November 11, 1890.

Application filed June 18 1890. Serial No. 355,848. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN WESLEY RUsK, a citizen of the United States, residing at Uhrichsville,in the countyof Tuscarawas and State of Ohio, have invented certain new and useful Improvements in Piston Extracting Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to jacks for disengaging piston-rods from their cross-heads, and has for its object to provide a simple and efficient device which can be readily fitted to any cross-head, and which will perform its work in a rapid and satisfactory manner.

The improvement consists of an internallythreaded sleeve and a pressure -screw, the sleeve being provided with retaininglugs, which are adapted to retain a purchase on the walls of the pin-hole in the cross-head.

The improvement also consists in the peculiar construction of the jack, which will be hereinafter more fully described and claimed, and which are shown in the annexed drawings, in which- "i V Figure l isa side view of a jack embodying my invention. Fig. 2 is across-section of the jack on the line X X of Fig. looking to the left. Fig. 3 is a side view of the jack, show ing its application, the cross-head being shown in section.

The jack comprises the sleeve A, which is internally threaded, and the pressure-screw B, which is screwed in the sleeve Aaud which is provided at its outer end with the square head b to receive a wrench or other instrument for turning the screw in the sleeve. This The sleeve is provided with retaining-lugs e and j, which project from diametrically-opposite sides of the said sleeves. The lug e is slightly in advance of the lug f, so that the two lugs may obtain an equal bearing on the incline wall of the pin-opening g in the cross-head G.

The operation of the invention is as follows: The main rod is disconnected from the crosshead G, and the jack is inserted in the opening in which the main rod Works and is given a quarter-turn to cause the lugs e and f to enter the pin-opening g on opposite side 'of the said opening in the cross-head in which the main rod works. In this position the inner end of the pressure-screw comes directly opposite the inner end of the piston-rod H, and by turning the pressure-screw the piston-rod will be pressed upon and disengaged from the cross-head by the pressure-screw, as will be readily understood.

Ha ing thus described my invention, whatI claim, and desire to secure by Letters Patent, 1s

1. A jack for the purpose hereinbefore specified,composed of a sleeve internally threaded and having lugs, as e and f, to enter the pinhole in the cross-head, and the pressure-screw screwed into the said sleeve, substantially as set forth.

2. The hereinbefore-described jack for disengaging the piston-rod from its cross-head, composed of an internally-threaded sleeve having lugs on its sides, one lug being set in advance of the other, and the pressure-screw screwed into the said sleeve, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN WESLEY RUSK.

Witnesses:

T. D. HEALEA, J. F. GREENE. 

